Coarse-grinding wheel for surfacing stone



May 19, 1925.

E. A. CHASE COARSE GRINDING WHEEL FOR SURFACING STONE Filed April 15 1922 2 Sheets-Sheet 1 By fiztorrieys E. A. CHASE COARSE GRINDING WHEEL FOR SURFAGING, STONE Filed April 15 1922 2 Sheets-Sheet 2 j/We/ztar 3 flzrarrrcys m tvvmj i Patented May 19, 1925 UNITED STATES ELROY A. CHASE, OF NORTHFIELD, VERMONT.

GOARSE-GRINDING- WHEEL 'FOR SURFACING STONE.

Application filed April 13, 1922.

To all whom it may concern.

Be it known that I, ELnoY A. CHASE, a citizen of the United States, residing at Northfield, in the county of Washington and State of Vermont, have invented a new and useful Coarse-Grinding WVheel for Surfacing Stone, of which the following is a specification.

This invention relates to a grinding wheel for surfacing stone and particularly for performing the first grinding operation on granite blocks or similar material having already an approximately plane surface, such as may be produced by my previously patented granite saw. v

It is the general object of my invention to provide a grinding wheel for such purposes, which will quickly produce a smooth and even surface on the stone.

A further object is to provide a wheel which will efiectively retain the grinding material on the grinding surface thereof, even when rotated beyond the edges of the work.

lVith these general objects in view, further features of'my invention relate to details of construction by which increased wear of the wheel is obtained and which promote eco-' nomical manufacture and eflicient operation thereof.

My invention further relates. to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which Fig. 1 is a transverse sectional elevation of my improved wheel;

Fig. 2 is a bottom view thereof;

Fig. 3 is a perspective plan view of one of the grinding members; v

Fig. 4 is an enlarged bottom view of a portion of one of the grinding members;

Fig. 5 is a detail sectional elevation, taken along the line 5- 5 in Fig. V

Fig. 6 is a detail side elevation, looking in the direction of the arrow 6 in Fig. 1, and

Fig. 7 is a bottom view of a modification.

Referring to the drawings, I have shown a grinding wheel comprising a frame or plate 1.0, which may be in the form of a flat disc having a central opening 11 therein. A driving member 12 is secured to the plate 10, said member having an upwardly Serial No. 552,278.

extending annular flange 13 and a head .14

made up of a plurality of grinding members 16 (Fig. 3), each member being more or less in the form of a spiral and having lugs 17 on its upper surface threaded to receive bolts or screws 18 (Fig. 1) by which said members are attached to the frame 10.

The lugs 17 have two important advantages. The grinding members are commonly formed of cast iron and these lugs 17 may be easily surfaced off to provide a plane surface to engage the frame or plate 10.

Furthermore, the binding screws 18 need extend a less distance into the members 16 and the members in consequence can be used until they are largely ground away before the ends of the screws 18 will appear on the grinding face.

In the preferred form of my construction, each grinding member 16 is provided with an outer face 20, inclined upwardly and inwardly as shown in Fig. 5. As the inner face of each member is also disposed at the same general inclination, the thicle ness of the main section of each grinding member is substantially constant throughout its height.

The inner face of each member is serrated to provide a series of pockets 21 (Fig. 41) which extend diagonally downward and rearward toward the working face of the member. The outer walls 22 of these pockets are preferably formed substantially concentric with the axis of the wheel.

All of the grinding members on my im proved wheel are preferably identical in size and shape, so that a wheel may be built up simply by securing the desired number of duplicate members 16 to the face of the frame or disc 10, as indicated in Figs. and 2.

' resume cutting as soon as a-particularpor-i centrifugal outward force The grinding members are so disposed that the centrifugal force developedby tne rotation of the wheel will work thegrinding material gradually outward as the wheel revolves. The grinding material-collects in the pockets 21, which slant rearwardly and downwardly and thus; deliver theamatei'ial under the lower or Working face of the grinding member. -As themmaterial works out from under one grinding member, it is immediately caught in the pockets of thenext outward member and :the feeding operation isrepeated. I

The pockets not only-act to collect and feed the material under the grinding members, but also permit the wheel to'be rotated.

beyond the edges ofthe work, asthe grinding material islield in the pockets; by the largely retainedon-thewheelin position to inwardly inclined toward the axis of said wheel. and haying serrated inner faces.

3-. A grinding wheel comprising a frame, means by which said frame may be rotated, ..and a .plurali ty.,, of grinding members mounted on said frame, said members hav- --.-i ng a- ;series -ofclosely, adjacent ledges on their inner faces extending the full height of; said, members-and said ledges being upwardly and rearwardly inclined to form pockets for the. grinding abrasive.

4.: A grinding wheel comprising aframe, means by which saidyframe ,may be rotated, and a plurality of grinding members -.1Y10ll11t(l. on said frame, said members ,hav-

ing a series ofsobliquely disposedpockets in their inner. faces, with. the outer wall; of

each pocket substantially concentric ;,with

d i th -othe axis ofsaidawheel.

5. A-grindingwheel comprising a frame, uneans by; WlilCll sa d fran' e i may be. aotatecl,

tionpof the wheel is again positioned over a d aaplurality of grinding members mountthe wvork. This property ofretainingthe grinding material is in itself avery. im.

portant advantage of-niy invention,:as it has been IEOUllCl'flIIlPOSSlblG with the: grinding wheels previously inuse to retain the grind ving material on tlieface of the wheel, ifthe wheel was=allowed to move beyond the edge but the particular that further changes and of the work.

The spiral grinding members 16- are shown inthedrawings as covering some.

1 ed .on, said frame, said members 1 comprising upwardly and inwardly disposed flanges of substantially uniform thickness and .havng a series of serratedgoblique projections on their:innerfaces forming. pockets to re- ;ceive the. grinding material.

6. A grinding wheel-comprising a frame, 1neans by which said frame may, .be rotated, Hand a plurality -.'of 'Lgrinding members i mountedon said frame, SfllCl;m6mb6IS l12LV- what less than a complete circumference,h g o iquely; disposed; pockets in theirinshape -and extent of. the

grinding members may be considerably varied within the scope offlmy invention.

In Fig. 7, I have shown a modification in which a single griiiding niember 25 forms.

a continuous spiral on the face of-the :wheel:

The wheel is'otherwise, substantially .similar ner faces extending the full height of, said substantially -concentric with the axis of S'tldfWhQGl.

7.; A grinding wheel comprising ae frame, means-by which said; frame may be rotated, and a plurality of grinding membersinountto thatalready described. a h S i w fl m h ying a described my invention: and thereof, it will' be evident modifications can be made therein by those skilled in the. art "within the spirit and scope ofmy invention as set forth in the claims," and I do not wish to be otherwiselimited to the details herein disclosed, but what I claim is Having thus the advantages series of frame-engaging,lugs on their up- ;wper faces, said li1gs,engag1ng=tlie.lowenface of said frame; and spacing saiclmembers therefrom.

8. A grinding wheel comprising a frame, means by; which said, frameanay. be rotated and a relatively long curyed grinding member secured to the-lower face of said'frame 1. A grinding wheelcoinpiusing a -.fname-, at 111 oblique angle to the circumference and means by which said frameimayi be rotated, grindingmembers mount-1 series of closely adjaceiit. -ledges onwtheir inner faces and said ledges being upwardly and rearwardly inclined toifo in .pocketstfor the grinding abrasive. i 2. A grinding wheelconiprising a frame, means by which said frame may be rotated, and a plurality of grinding members mounted on said frame, said membershaving continuous outer faces upwardly. and

to any radius of said fr amelcrossed bysaid member,said nieinbe-r; iaving a serrated inner faceaforming a.-series;0f pockets to receive the grinding ma teriahsaid pockets extending upwardly from the grinding face of. said-member .a-nd tl1Q-;OL1t61.;\V3.ll of each pocket 5 being substantially concentric with the axis of said wheel. i

. Infltestimony whereof I, have hereunto affixed my signature.

i nov A. oHAsn.

members, with the outer wall of, said. pockets 

